Adult Amethyst Dragon

Amphibious. The dragon can breathe both air and water.

Legendary Resistance (3/Day). If the dragon fails a saving throw, it can choose to succeed instead.

Multiattack. The dragon makes one Bite attack and two Claw attacks.

Bite. Melee Weapon Attack: +12 to hit, reach 10 ft., one target. Hit: 18 (2d10 + 7) piercing damage plus 9 (2d8) force damage.

Claw. Melee Weapon Attack: +12 to hit, reach 10 ft., one target. Hit: 11 (1d8 + 7) slashing damage.

Singularity Breath (Recharge 5–6). The dragon creates a shining bead of gravitational force in its mouth, then releases the energy in a 90-foot cone. Each creature in that area must make a DC 20 Strength saving throw. On a failed save, the creature takes 45 (10d8) force damage, and its speed becomes 0 until the start of the dragon's next turn. On a successful save, the creature takes half as much damage, and its speed isn't reduced.

Change Shape. The dragon magically transforms into any creature that is Medium or Small, while retaining its game statistics (other than its size). This transformation ends if the dragon is reduced to 0 hit points or uses a bonus action to end it.

Psychic Step. The dragon magically teleports to an unoccupied space it can see within 60 feet of it.

Legendary Action Uses: 3. Immediately after another creature's turn, The dragon can expend a use to take one of the following actions. The dragon regains all expended uses at the start of each of its turns.

On initiative count 20 (losing initiative ties), the dragon can take one of the following lair actions; the dragon can't take the same lair action two rounds in a row:

• Beguiling Whisper. The dragon telepathically whispers to one creature within range of the dragon's telepathy. The creature must succeed on a DC 15 Wisdom saving throw or be charmed by the dragon until initiative count 20 on the next round. A creature charmed in this way obeys to the best of its ability any command the dragon issues that isn't directly harmful to the creature.

• Imprisoning Force. The dragon casts the forcecage spell, using its spell save DC and requiring no spell components. The spell ends early if the dragon uses this lair action again or dies.

• Spatial Projection. The dragon chooses a space it can fit into within the lair. It exists in its own space and the chosen space simultaneously until initiative count 20 on the next round. Whenever it moves or takes an action, it chooses which version of itself is moving or acting. If an effect or attack can target both of the dragon's spaces at the same time, the dragon is affected only once.

The region surrounding a legendary amethyst dragon's lair is altered by the dragon's magic, creating one or more of the following effects:

• Background Check. Once per day, the dragon can cast the legend lore spell, requiring no spell components, naming any person, place, or object within 1 mile of the lair as the spell's subject.

• Crystal Profusion. Amethyst crystals and geodes form along muddy shores and lake beds within 6 miles of the lair.

• Thriving Wildlife. Fish and other aquatic Beasts reproduce rapidly and thrive in bodies of water within 6 miles of the lair. Foraging in these waters yields twice the usual amount of food.

• Watery Sight. Water within 6 miles of the lair is a conduit for the dragon's psionic presence. As an action, the dragon can cast the clairvoyance spell, requiring no spell components and targeting any body of water in that region.

If the dragon dies, the populations of aquatic life near the lair return to normal levels over the course of 1d10 days. The existing abundance of amethysts remains, but new crystals and geodes form at a normal rate.